Business Segments and International Operations (Revenue from External Customers from Different Geographical Areas) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2020	Aug. 31, 2019
Revenue from External Customer [Line Items]
Segment revenue	$ 109,699	$ 106,716	$ 319,765	$ 296,260
North America
Revenue from External Customer [Line Items]
Segment revenue	62,927	60,208	184,904	163,766
EMEA
Revenue from External Customer [Line Items]
Segment revenue	37,447	35,109	106,592	102,114
Latin America
Revenue from External Customer [Line Items]
Segment revenue	3,547	5,470	10,893	14,039
Asia Pacific
Revenue from External Customer [Line Items]
Segment revenue	$ 5,778	$ 5,929	$ 17,376	$ 16,341